Alert for Hosts not Online

[itsmevic]

I'd like to know when a series of hosts go offline.  What would be the best SPL to use with something like this? 

Thanks for your help! 

[joshd · Accepted solution]

Alerting for hosts not available is a common question that comes up on the Splunk Slack Community chat, so much that it has the following templated reply 🙂  The following resources should certainly help solve your problem.

Meta Woot! https://splunkbase.splunk.com/app/2949/
TrackMe https://splunkbase.splunk.com/app/4621/
Broken Hosts App for Splunk https://splunkbase.splunk.com/app/3247/
Alerts for Splunk Admins ("ForwarderLevel" alerts) https://splunkbase.splunk.com/app/3796/
Monitoring Console https://docs.splunk.com/Documentation/Splunk/latest/DMC/Configureforwardermonitoring
Deployment Server https://docs.splunk.com/Documentation/DepMon/latest/DeployDepMon/Troubleshootyourdeployment#Forwarde...

Some helpful posts:
https://lantern.splunk.com/hc/en-us/articles/360048503294-Hosts-logging-data-in-a-certain-timeframe
https://www.duanewaddle.com/proving-a-negative/

[thambisetty]

Are you managing these hosts using deployment server?

if yes, you can make use of deployment sever logs. If you don’t see phonehome for last n minutes, you could create an alert.